is it possible to have 64-bit PCI on a single processor motherboard?

[imgod2u]

The title basically says it all. I have an Adaptec 29160, it fits in my current 32-bit PCI slot fine, but I'm not getting the full bandwidth of the card. Maybe that's why my SCSI setup isn't quite what I'd expect it to be, albeit still quite fast. Anyway, is it possible to have a 64-bit PCI on a single-processor motherboard and if so, who makes them?

 

[Diable]

Its possible but nobody makes one.

 

[JamesSki]

I think you need at least 3 drives hooked up to that adapter to even come close to the bandwidth your currently capable of. How many do you have?

 

[imgod2u]

I have 2x 10k rpm HD's. I'm worried about burst speed though as HDTach seems to report quite a low burst speed.

 

[maddmax]

Does it say 160 behind each hard drive that is Ultra 160 capable during the scsi bus scan at bootup? And what are your HDtach scores? Maybe the problem is your benchmark program.

 

[Daovonnaex]

Many planars have at least one 64-bit PCI slots these days, so yes.

 

[Peter]

Well ... you need a chipset that offers 64-bit PCI in the first place.

What do we have currently?

ServerWorks chipsets have that, AMD's 762 north bridge has it, VIA has just presented a bridge chip that adds it (losing the AGP in the process), and Intel has a PCI-64 hub chip for their higher end chipsets like the 840 and 850. None of these solutions comes at a price you'd sell a single processor board to anyone.

There simply are no reasonably priced chipsets that do it.

regards, Peter

 

[Peter]

Oh, and if your Adaptec doesn't deliver on burst rates, check its BIOS setup ... SCSI channel speed(s) can be limited there, and you wouldn't be the first to have all synchronous modes disabled. Set to U160, Disconnect and Tagged Queuing enabled for all devices (the actual speed and mode used for each device will be auto-negotiated, only buggy devices need the manual intervention offered in SCSI BIOS).

regards, Peter